I had a new boiler(Greenstar CDi30) fitted last summer. I am out at work all day so have been using the timer for the system to come on before I get up and again just before I come home from work. I came home early the other day and the heating was on, before the programmed time. I woke during the night and the heating was on again. Any ideas? Thanks.
Help, problem with Greenstar CDi boiler
- Thread starter tajk
- Start date
i believe that the d20 programmer offers timing conrol for the dhw preheat it could be that the boiler is fireing up and trying to satisfy the dhw, but if the diverter vavle is sticking slightly you will get heat into the radiator circuit! anyhow get onto worcester because its still under warrenty 
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